CNRS, Université de Bordeaux , ICMCB, UPR 9048, 33600 Pessac, France.
Inorg Chem. 2013 Nov 4;52(21):12811-7. doi: 10.1021/ic402152f. Epub 2013 Oct 25.
ZnO nanocrystals were prepared from polyol-mediated synthesis. Two key parameters, that is, the zinc precursor concentration and the alcohol mixture chosen as synthesis medium, were varied. The increase of the precursor concentration and the decrease of the permittivity of the alcohol mixture were shown to favor the crystallite growth, leading to crystallite sizes ranging from 5 to 35 nm. The aggregation behavior of the nanocrystal units to form or not polycrystalline spheres, depending on the van der Walls interaction density, was shown and explained. Every sample was accurately characterized by X-ray diffraction; cell parameters were extracted from full pattern matching refinements. A clear correlation between crystallite size and cell parameters, that is, an asymptotic decrease of a and c cell parameters versus the crystallite size, was established. A simple model was also successfully developed to interpret the as-established correlation.
氧化锌纳米晶体通过多元醇介导的合成方法制备。两个关键参数，即锌前驱体浓度和作为合成介质的醇混合物，被改变。结果表明，前驱体浓度的增加和醇混合物介电常数的降低有利于晶核生长，从而导致晶粒度在 5 到 35nm 之间变化。纳米晶单元的聚集行为表现为形成或不形成多晶球，这取决于范德华相互作用的密度，并对此进行了说明和解释。每个样品都通过 X 射线衍射进行了精确的表征;通过全图案匹配细化提取了晶胞参数。建立了晶粒度和晶胞参数之间的明确相关性，即晶胞参数 a 和 c 随晶粒度的渐近减小。还成功开发了一个简单的模型来解释所建立的相关性。
